Regulation of Pyruvate Kinase Type M2 by A-Raf: A Possible Glycolytic Stop or Go Mechanism

Recently a link between A-Raf, cellular energy homeostasis and synthetic pathways has been suggested through the identification of pyruvate kinase type M2 (M2-PK), a key glycolytic enzyme, as interaction partner of A-Raf. In this study, we demonstrated that A-Raf is an important regulator of M2-PK f...

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Veröffentlicht in:Anticancer research 2007-11, Vol.27 (6B), p.3963-3971
Hauptverfasser: MAZUREK, Sybille, DREXLER, Hannes C. A, TROPPMAIR, Jakob, EIGENBRODT, Erich, RAPP, Ulf R
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container_end_page 3971
container_issue 6B
container_start_page 3963
container_title Anticancer research
container_volume 27
creator MAZUREK, Sybille
DREXLER, Hannes C. A
TROPPMAIR, Jakob
EIGENBRODT, Erich
RAPP, Ulf R
description Recently a link between A-Raf, cellular energy homeostasis and synthetic pathways has been suggested through the identification of pyruvate kinase type M2 (M2-PK), a key glycolytic enzyme, as interaction partner of A-Raf. In this study, we demonstrated that A-Raf is an important regulator of M2-PK function. In primary mouse fibroblasts, which are characterized by glutamine production and serine degradation, A-Raf induced dimerization and inactivation of M2-PK, thereby reducing conversion rates from glucose to lactate. In immortalized NIH3T3 fibroblasts, showing glutamine degradation and serine production, oncogenic A-Raf increased the highly active tetrameric form of M2-PK and favored glycolytic energy production. High serine levels thus may be responsible for the activation of M2-PK in A-Raf transformed NIH3T3 cells.
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subjects Animals
Biological and medical sciences
Cell Transformation, Neoplastic - metabolism
Dimerization
Fibroblasts - enzymology
Fibroblasts - pathology
Glutamine - metabolism
Glycolysis
HT29 Cells
Humans
Immunoprecipitation
Medical sciences
Mice
NIH 3T3 Cells
Proto-Oncogene Proteins A-raf - metabolism
Pyruvate Kinase - metabolism
Serine - metabolism
Tumors
title Regulation of Pyruvate Kinase Type M2 by A-Raf: A Possible Glycolytic Stop or Go Mechanism
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